Particle Morphology Control of Polypropylene Heterophasic Copolymer at Increased EPR Content by Simultaneous Cross-linking

Meng-jia Zhang; Li Wang; Liu-ting Hong; Ya-wei Qin; Jin-yong Dong

doi:10.11777/j.issn1000-3304.2019.19115

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Particle Morphology Control of Polypropylene Heterophasic Copolymer at Increased EPR Content by Simultaneous Cross-linking

更新时间：2021-01-26

- Particle Morphology Control of Polypropylene Heterophasic Copolymer at Increased EPR Content by Simultaneous Cross-linking
- Acta Polymerica Sinica Vol. 51, Issue 2, Pages: 166-173(2020)
- 作者机构：
  
  1.中国科学院化学研究所中国科学院工程塑料重点实验室　北京 100190
  2.中国科学院大学　北京 100049
  3.中国石油天然气股份有限公司石油化工研究院　北京 102206
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2019.19115
  CLC：
- Published：2020-2，
  
  Published Online：27 August 2019，
  
  Received：10 June 2019，
  
  Revised：9 July 2019，
扫描看全文
Meng-jia Zhang, Li Wang, Liu-ting Hong, Ya-wei Qin, Jin-yong Dong. Particle Morphology Control of Polypropylene Heterophasic Copolymer at Increased EPR Content by Simultaneous Cross-linking. [J]. Acta Polymerica Sinica 51(2):166-173(2020)
DOI：

Meng-jia Zhang, Li Wang, Liu-ting Hong, Ya-wei Qin, Jin-yong Dong. Particle Morphology Control of Polypropylene Heterophasic Copolymer at Increased EPR Content by Simultaneous Cross-linking. [J]. Acta Polymerica Sinica 51(2):166-173(2020) DOI： 10.11777/j.issn1000-3304.2019.19115.

摘要

基于MgCl

负载Ziegler-Natta催化剂的丙烯多相共聚(丙烯均聚或与少量乙烯无规共聚和乙烯丙烯无规共聚制备乙丙橡胶的串联聚合)是工业丙烯聚合的主要方法之一，聚合物粒子形态控制是丙烯多相共聚的关键. 尤其是对于制备高EPR含量的TPO，如何控制高EPR含量时的产物粒子形态，将EPR限制于粒子内部而不向表面溢出，是丙烯多相共聚需要解决的关键科学问题. 本文报道以非共轭

-双烯烃在乙丙无规共聚中使EPR发生同步交联是解决此问题的有效手段. 同步交联使EPR的黏弹性发生突变，黏度和弹性迅速增大，抑制了纳米尺度胶粒在分散的催化剂初级粒子表面形成后的迁移及聚集，一方面使EPR在多相共聚物粒子内部分散均匀，另一方面避免了EPR的溢出而使共聚物粒子形态得到保持. 本研究为丙烯多相共聚制备高EPR含量聚丙烯热塑性弹性体提供了一种参考方法.

Abstract

Heterophasic copolymerization of propylene based on MgCl

-supported Ziegler-Natta catalysts

that is

sequential propylene homopolymerization or copolymerization with minor amount of ethylene followed by ethylene/propylene random copolymerization for EPR

is a major polymerization technique in polypropylene industry

whose products

depending on their EPR contents

include high impact PP (h

where EPR weight fraction is normally less than 40%) and thermophastic olefin elastomer (TPO

where EPR weight fraction is higher than 50 wt%). Compared to h

the production of TPO is rather more challenging

for increased EPR contents makes it very difficult to prevent EPR from overflowing to the surfaces of the polymer particle

which will mess up with the particle morphology and lead to serious reactor fouling issues

affecting the production continuity. How to control the particle morphology at increased EPR contents with EPR being authentically contained inside without contaminating the surfaces has become a key scientific issue in further developing heterophasic copolymerization of propylene to TPO. This paper reports that the solution may lie in a simultaneous cross-linking of EPR using nonconjugated

-diolefin during its polymerization. It is shown that simultaneous cross-linking can alter EPR’s viscoleastic properties to a great extent

exponentially increasing its low-shear viscosity and elasticity. As a result

EPR no longer poses as aggregated volatile droplets but rather large-size phase domains are formed by hot-compression; instead

it features dispersed particles discrete to each other. In turn

no overflowing of EPR occurs to the polymer particle surfaces. This research provides a solution for heterophasic copolymerization of propylene and polypropylene thermoplastic elastomer with high EPR content.

关键词

丙烯多相共聚Ziegler-Natta催化剂聚丙烯热塑性弹性体非共轭αω-双烯烃粒子形态控制

Keywords

Heterophasic propylene copolymerizationZiegler-Natta catalystPolypropylene thermoplastic elastomerNonconjugated αω-diolefinParticle morphology control

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Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Acadamy of Sciences

University of Chinese Acadamy of Sciences

Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Acadamy of Sciences

Shaanxi Yanchang Zhongmei Yulin Energy & Chemical Company

CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Acadamy of Sciences

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